We have all heard about the older machines liking older size nickels for more accurate payouts and less jamming. Just for kicks I grabbed some nickels out of my machines and took these two photos. One nickel not really noticeable two you can feel a difference and 6 is obvious. Imagine how 20 would stack up and could cause issues.

Looking for survivor machines especially vendor fronts or original side vendors with or withouta machine. 1920's-30's goosenecks, round escalators. I enjoy hand painting the castings.